BINDRESVPORT(3) Linux Programmer's Manual BINDRESVPORT(3) NAME bindresvport - bind a socket to a privileged IP port SYNOPSIS #include <sys/types.h> #include <netinet/in.h> int bindresvport(int sockfd, struct sockaddr_in *sin); DESCRIPTION bindresvport() is used to bind a socket descriptor to a privileged anonymous IP port, that is, a port number arbitrarily selected from the range 512 to 1023. If the bind(2) performed by bindresvport() is successful, and sin is not NULL, then sin->sin_port returns the port number actually allo- cated. sin can be NULL, in which case sin->sin_family is implicitly taken to be AF_INET. However, in this case, bindresvport() has no way to return the port number actually allocated. (This information can later be obtained using getsockname(2).) RETURN VALUE bindresvport() returns 0 on success; otherwise -1 is returned and errno set to indicate the cause of the error. ERRORS bindresvport() can fail for any of the same reasons as bind(2). In addition, the following errors may occur: EACCES The caller did not have superuser privilege (to be precise: the CAP_NET_BIND_SERVICE capability is required). EADDRINUSE All privileged ports are in use. EAFNOSUPPORT (EPFNOSUPPORT in glibc 2.7 and earlier) sin is not NULL and sin->sin_family is not AF_INET. ATTRIBUTES Multithreading (see pthreads(7)) Before glibc 2.17, the bindresvport() function uses a static variable that is not protected, so it is not thread-safe. Since glibc 2.17, the bindresvport() function uses a lock to protect the static variable, so it is thread-safe. CONFORMING TO Not in POSIX.1-2001. Present on the BSDs, Solaris, and many other sys- tems. NOTES Unlike some bindresvport() implementations, the glibc implementation ignores any value that the caller supplies in sin->sin_port. SEE ALSO bind(2), getsockname(2) COLOPHON This page is part of release 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/. 2013-06-21 BINDRESVPORT(3)
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